Furnace.



A. SCHROEDER.

PURN-ACE.

APPLICATION FILED JUNE 1s. 1911.

1,041,889. Patented ot.22,1912.

2 SHEETS-SHEET 1.

N i t A.SGHR0BDBR. FURN'ACE.

APPLICATION FILED JUNE 13. 1911. 1,041,889, .Patented 00h 22, 1912.

2 SHEETS-SHEET Z.

l v ANTON SCHROEDER, E4 BELLEVILLE, ILLINOIS.

FURNAGE.

Specification of Letters Patent.

Patented oct. 22,1912.

Application mea .Tune 1a,1.-n1 serial No. 632,908.

T o all whom 'it may concern:

Be itknown that I, ANTON ScHRonDER, a citizen of the United States, residing at Belleville, in the county of St. Clair and 5 State of Illinois, have invented certain `newl and useful Improvements in Furnaces, of .which the following is a` specification, reference being had to the accompanying drawings.

This invention relates to improvements in furnaces and particularly to improvements in furnaces adapted for use with radiators in heating buildings.

An object of this invention is to provide 1:'5 a furnace which will combine the good feaj tures of the sectional furnace with the good features of the water-tube or tubular furnace.

Another object. of this invention is the provision of a furnace of the character just mentioned in which there will be water- .space wherever there are hot gases up to the point where the latter leave t-he furnace,-that is, up to the' termination of the last Hue.

A third object of this invention is to pro` vide a furnace of the character just mentioned with increased boiler heating-surface without increasing the size of the furnace.

'Afifourth object of this invention is the provision in a furnace of the character justmentioned of a path for the heated gases which .will insure that the latter will give up to the water a maximum proportion of their heat, wherebyy the etliciency ofthe boiler will be increascch fifth object of this invention is the provision of means .for insuring a complete circulation of the water between the different sections 0f the boiler. Y

A sixth object of this invention is the provision of a furnace of the type just mentioned which will he equally well suited for use with a steam-'heating system orvwith a hot-water heating system.

u? Other features of this invention will be pointed out in the description which follows.

In the drawings illustrating the principle of this invention and the best mode now .50 known to me of applyingT that principle.

tion on the line Br-'B of Fig. l; and Fig. 4 shows 1n perspective view my new fur-n 55 nace adapted for use with a steam-heating `system and with the front broken away and parts shown in section for sake of clearness. e, The she-ll of the furnace consists of the front wall a., the rear wall b, the sidesc and the top d.' The water-space within this outer shell-iis. divided into three sections namely, the front ,waterspace or section e, the rear Water-space or `section f and the middle water-space or section g. At the front of vthe furnace and within the outer shell there .extends transversely thereof a wall h which is the rear wall of the front water-space e; and to this transverse wall L there is suitably fastened the. transverse wall z', which is 70 the front wall of the middle water-space g.

An entirely similar construction is found at the rear of the furnace where the transverse wall y' is the frontwall of the rear waterspace f and the transverse wall 7c is the rear 75 wall of the middle water-space g, the walls y', /c being suitably fastened together. The lengthwise extending walls m, 'n form the lateral or side wall of the middle sectiony g. Speaking generally, it may be said that the front water-space e and the rear water-space f extend transversely of the furnace, while v the water-spaces of the middle section g extend lengthwise of the furnace. The latter is provided with the usualfirebox 0, the lire door p therefor, the grateg and the ashpit r belowgthe same. In thev 'particular embodimei'it lof this invention shown in the' accompanying drawings, there are two sets" s, t. of water tubes; but it is obvious that the number of sets of water tubes may be varied to meet the requirements of the particular installation in hand. The lower set s of waterl tubes is arranged just above the tire i box 0 and consists of two rows arranged one 95 above the other, the tubes u of the lower row being staggered with relation to the tubes o of the upper row. Hence, the hot gases, which risecfrom the fuel-bed, will, in passing between the tubes mbe forced to 10e divide and to strike the tubes o of the upper row. These water tubes upv, extend-lengthwise or from end to end* of the middle section g and communicate with the front water-space e at their front ends and .with the rear water-space f at` their rear ends.

ILO

The arrangement of the upper set t of water tubes is entirely similar to that of the lower set s and need not be further described.

Between the sets s, t of water tubes there is mounted a shallow/horizontal boX like section w which extends from side to side of the middle section g and which is entirely open at its sides, and. therefore, communicates most freely with the lateral waterspaces a: of this section g. The horizontal box-like section t0 is closed at its rear end w but it communicates through three holes w with the front water-space e. As is best shown in Figs. 2 and 3, this rear wall w is separated by a substantial interval from the rear wall 7.: of the middle section, whereby a passage isv provided for the hot gases. Above the upper set t of waterwtubes are the two fines ,1/ between which is a water-space e. Extending intopeach of the iiuesey/ is a shallow boX-like horizontal section 2 the front ends 2 of which are closed and the rear ends of which communicate through holes 2 with the rear water-space f. At its outside or the side next toa side-wall of the shell of the furnace), each box-like section 2 is open to. one of the lateral waterspaces of the middle section g but` on its opposite side or inner side it is closed by the inside wall of the flue y in which it lies. Suitable pipes 3 are provided for the circulation of the water to and from the radia tors. The front and rear walls a, are provided with suitable panels 4 opposite the ends of the water tubes. Vhen the panels i are removed, access is obtained to the interior of the shell of the furnace to permit the setting and rolling of the tubes andfor the repair thereof. After the tubes have been set and rolled or a defective tube replaced by a new one,these panels 4 may be replaced and screwed up tight to the faces of the furnace and, when so screwed ,up tight, the panels are, of course, watertight.

The heated products of combustion rise from the fuel bedin the tire-box 0, divide and pass between the lower tubes u of the lower set s. They strike against the tubes fvof the. upper row and again divide and pass between the' latter tubes. They then strike the bottom wall fwX of the lower box-like section to and pass to t-he rear of the latter. Since ther-eis a substantial interval between the rear vend fw of the boxlike section 'w and the rear wall of the middle section g, the heated gases are free to pass upwardly in the open space thus provided and Contact in their upward flow with the rearend w and the rear wall 7c .of the ,middle section g. They next strike the upper set t of water tubes, pass between the tubes .of this upper rset in exactly the same mannerhas they did between the tubes of'the lower set .sA and strike against the bottoni walls 2X of the shallow box-like sections 2. They next pass foresee to the front end of the furnace and during their passage contact with the top wall of the lower shallow box-like section fw, the bottom walls of the upper shallow box-like sections 2 and the tubes t between these sections w, 2 g' and since there is an interval between the front walls 2 of the box-like sections 2. and the front wall z' of the middle section g, the gases are free to' rise through the open space thus provided and-in their upward passage contact with these walls z', 2. The gases now iiow over the top of the sections 2 and through the ilues g/ to the rear of the latter and thence out to the smoke-stack. From the foregoing descripw tion it will be obvious that the heating surface in the combined sectional and watertube furnace hereinbefore described is greater than it would be, were the furnace merely sectional and that the addition of the water-tubes makes the heating conditions muchl better. The heated products of combustion divide upon striking the lower row of tubes of each set and cannot possibly escape without striking the upper tubes of each set. Again the products of combustion strike against the bottom of the box-like sections y, 2 and flow over their closed ends and top walls. Thus, wherever there are heated gases in the furnace there is also water-space, until the termination of the last flue. During their passage` from rear to front of the furnace, these hot gases will contact with the upper set t of water tubes, with the top wall of the-lower box-like section w and the bottom walls of the upper box-like sections 2.

The circulation of the water is complete, as will be obvious from the foregoing description. The water-tubes very eifectually connect the front water-space e `and the rear water-space f and create a vigorous circulation of the water; and these water-spaces e, j communicate with the lateral water-spaces :r of the middle section g (Fig. l) by means of holes 5 formed in thewalls separating the middle section from the front and rear sections, respectively (Figui). In Fig. 4 the furnace is shown equipped with a steam dome 6. Y

The capacity or heating surface of the furnace may be increased by increasing the number of sets of tubes o, u; and it may also be increased by increasing the number of sections g, the furnace being enlarged by adding one or more sections g. A single section g is more easily constructed. of course, than is a larger unit and herein lies a great advantage of the hereinbefore-deseribed furnace. vAn effective change by way of varying the capacity of the furnace may be made by removing the central section; and the furnace may be.rest0red to its original capacity, of course, by replacing this central section, This removal and replacement of llOO annees the central section may readily be edected.

Indeed, the central section is the'only one' is provided a substantial interval for the passage of the products of combustion.

2. A furnace having a pair of end watersections; water-tubes connecting sind water- Sections; lateral water-spaces between and communicating with said watensections; and an intermediate water -`section which communicates with one of said end water-sections and with said lateral water-spaces and between the end wall of which and the opposed wall ot the other of said end watersections there is provided a substantial interval for the combustion.

43. A furnace having a pair ofend Water- Sections; a plurality of sets of water-tubes connecting said water-sections; and an interine iiate water-section which communicates with one of said end water-sections and which is mounted between said sets of watertubes and between the end wall of which and the opposed wall of the other of said end waer-sections there is provided a substantial interval for the passage of the products of combustion.

4. A furnace having a pair of end watersections; an intermediate water-section whicl`y communicates with one ofsaid end water -sections and between the end wall of whielA and the end'water-section opposed tc '.)ad end wall there is provided a substantialinterval for the passage of the products of combustion; a second intermediate water-section which communicates with one of said end water-sections and between the end wall of which Aand the end water-section opposed to the last-named end wall there is previded a substantial interval for the passage of the products of combustion;

and water-tubes which communicate with said kend water-sections and which are mounted between said intermediate watersections.

5. A furnace having a pair of end watersecti'ons; an intermediate water-section which communicates with one of said watersections and between the end wall of which an the endwater-section opposed to said wal there is provided a, substantial inter v l l'orthe passage of the products of comustion; and a. pair of sets of water-tubes passage of the products of' which connect seidend sections and between which is mounted said intermediate watersection.-

6. A furnace having a pair of end watersections; a plurality-of sets of watertubes connecting said water-sections; lateral lwater-spaces between and communicating with said water-sections; and an intermediate water-section which communicates with one of said end water-sections and whichis mounted between said sets of water-tubes and between the end wall of lwhich and the opposed wall of the other of said. end water-sections there is provided a substantial interval for the passage et the products 'of combustion.

7.' 'A furnace having a pair of end water- -sectionsg lateral water-spaces between and communicating with said waterlsections; an

intermediate water-section which communi. cat-es with one of said end water-sections and between the end wall of which and the end water-section opposed to said end wall there'is provided a substantial interval for the passage of the products of combustion; a second intermediate water-section which communicates with one of said end watersections and with said lateral water-spaces and between the end wall of which and the wall of the end water-section opposed to the last-named end wall there is provided a substantial interval for the passage of the products of combustion; and water-*tubes which connect said end water-sections and which are mounted between said intermediate water-sections. v

8. A furnace having a pair of end. water# sections; lateral water-spaces between an communicating with said water-sections; an intermediate water-section which communicates with one of saidend water-sections and with said lateral water-spaces and betweenl the end wall' of which and the end water-section opposed to said wall there is provided a asubstantial interval for the passage of the product-s of combustion; and a pair of sets of water-tubes which connect said end sections and between which is mounted said intermediate water-section.

9. A :furnace having a pair' of end watersect-ions; a pair of reversely-disposed intermediate water-sections one of which comu municates with one of said end water-secica tions and the other of which communicates `.li'ate Water-sections and lwhich connect said end Water-sections.

11. A furnace having 'a palr of end Watersections; lateral water-spaces between and communicating VWith said water-sections; a'

ue; an intermediate Water-section which is mounted in the latter and which communicates with one of said end Water-sections and with said lateral Water-spaces and between the end Wall of which and the end Watersection opposed to said Wall there is provided a substantial interval for the passage of the products of combustion; and Watertubes which connect said end sections.

l2. ,A furnace having a pair of end Watersectious; a iue; an intermediate Water-section which is mounted in the latter and which communicates with one of Said end Water-sections and between the end Wall of which and the end Water-section opposed to said Wall there is provided a substantial interval for the passage of the products of combustion; and Water-tubes which connect said end sections.

Signed at Belleville, Illinois, this 10 day of June, A. D. 1911, in the presence' of thc two undersigned Witnesses.

ANTON SCHROEDER.

Witnesses:

CONRAD GEIL, EDW. LEOPOLD.

Copies of this patent may be obtained for :uve cents each, by addressing the Commissioner of Ilatentsv i Washington, ZD. C. 

